What is Theme Editor in WordPress?

In WordPress, the theme editor is a simple text editor that can be found under Appearance » Editor. It lets you edit WordPress theme files directly from the admin area. When you choose another to modify the code, the editor only opens the theme files.

Theme editor is a simple text editor in WordPress located at Appearance » Editor. It allows us to modify WordPress theme files from the admin area. ... It is important to note that if we don't know how to code, then we should NOT be using the theme editor. Often users use the theme editor to edit the functions.